Interesting... my first reaction said "oh, they're just putting new shells on eliminating the Mini from the ride." It could be that, for a re-theme, they wanted to use different vehicles. If you'll remember, one of the many immediate changes made by CF after buying Geauga Lake was that the vintage Buick advertisement on the 50's midway was replaced with a Thunderbird ad. Maybe they want to make them little Mustangs or Mazdas?
Also, the OP said that it was a truck and trailer, im guessing one or both of the minis was in-tow.